A Dominant 7th, 1st inversion (C# in the bass)

EGAC#
4 4
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Notes, from the bass up

C# (bass)EGA

The same notes as A Dominant 7th (C#, E, G and A), rearranged so C# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.

See the full A Dominant 7th page for root position, every other inversion, open voicings and the chord formula.